Butternut Squash Pakoras

Name: Butternut Squash Pakoras
Ingredients: One 1-lb. butternut squash, peeled, quartered, seeded, and coarsely grated; 1 Tbsp. dried parsley; 2 tsp. ground cumin; 1½ tsp. crushed red chile flakes; 1 tsp. baking soda; 1 tsp. ground coriander; 1 tsp. granulated garlic; 1 tsp. freshly ground black pepper; 1 tsp. kosher salt; 1 tsp. ground turmeric; 1 small red onion, thinly sliced; 1½ cups gram flour (from chana dal, not from yellow split peas); Vegetable oil, for frying; Tamarind chutney, for serving (optional)